Crazy conversations

So, the conversation with my 10 year old son went something like this:

Son: Who's your son?
Me: You are.
Son: What's you are?
Me: You are.
Son: What's you are?
Me: The initials of that dude over there.
Son: What's a dude?
Me: You are.
Son: What's you are?
Me: Two letters in the alphabet.
Son: What's letters?
Me: It's mail.
Son: What's mail?
Me: A man.
Son:  What's a man?
Me: You are!

You follow?